% define a matrix whoes type is integer.
matrix=[1:1:5;2:1:6;4:2:12]
% get a remainder
rem(matrix,3);

% quote elements of a matrix
matrix(1,2) % index
matrix(10) % order number

% get a child matrix from a parental matrix
matrix(1:2,:)
matrix(2:3,1:3)
matrix(end,2:end)
matrix([2,1],[4,4,3])

% delete a child matrix
matrix(:,1:2)=[];
matrix % 3*3

% reshape into n*1 shape
matrix(:)

% 

